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Report on Sheveluch (Russia) — 14 January-20 January 2004

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 14 January-20 January 2004
Managing Editor: Gari Mayberry

Please cite this report as:

Global Volcanism Program, 2004. Report on Sheveluch (Russia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 14 January-20 January 2004. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (14 January-20 January 2004)


Sheveluch

Russia

56.653°N, 161.36°E; summit elev. 3283 m

All times are local (unless otherwise noted)


During 11-12 January, explosions at Shiveluch produced ash plumes to 4 km a.s.l. that drifted W. The explosions were accompanied by pyroclastic flows with run-out distances around 1 km. On 16 January at 1125 an eruption produced an ash plume that rose ~5.5 km a.s.l. and drifted W. The same day KVERT raised the Concern Color Code to Orange from Yellow. During 9-16 January, seismicity was above background levels at Shiveluch, with the recording of ~70 shallow earthquakes greater than M 1.75 and a large number of weaker earthquakes beneath the active lava dome. In addition, intermittent spasmodic tremor was recorded during 11-16 January.

Geologic Background. The high, isolated massif of Sheveluch volcano (also spelled Shiveluch) rises above the lowlands NNE of the Kliuchevskaya volcano group. The 1300 km3 volcano is one of Kamchatka's largest and most active volcanic structures. The summit of roughly 65,000-year-old Stary Shiveluch is truncated by a broad 9-km-wide late-Pleistocene caldera breached to the south. Many lava domes dot its outer flanks. The Molodoy Shiveluch lava dome complex was constructed during the Holocene within the large horseshoe-shaped caldera; Holocene lava dome extrusion also took place on the flanks of Stary Shiveluch. At least 60 large eruptions have occurred during the Holocene, making it the most vigorous andesitic volcano of the Kuril-Kamchatka arc. Widespread tephra layers from these eruptions have provided valuable time markers for dating volcanic events in Kamchatka. Frequent collapses of dome complexes, most recently in 1964, have produced debris avalanches whose deposits cover much of the floor of the breached caldera.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Itar-Tass News